再次返回时导航栏消失

Question

I'm using a UINavigationBar on top of my TableView . Whenever I touch a cell and come back to the TableView again NavigationBar disappears. What shall I do?

 override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {


        if indexPath.section == 0{

             let cell =  tableView.dequeueReusableCell(withIdentifier: fa_color_arrayOfCellData[indexPath.row].cell, for: indexPath) as UITableViewCell

            let (fa_ColorArgumentsContent) = fa_color_arrayOfCellData[indexPath.row].text
            cell.textLabel?.text = fa_ColorArgumentsContent
             cell.textLabel?.textAlignment = NSTextAlignment.right


            //set the data here
            return cell
        }
        else if indexPath.section == 1 {
            let cell =  tableView.dequeueReusableCell(withIdentifier: fa_system_arrayOfCellData[indexPath.row].cell, for: indexPath) as UITableViewCell

            let (fa_SystemArgumentsContent) = fa_system_arrayOfCellData[indexPath.row].text
            cell.textLabel?.text = fa_SystemArgumentsContent
            cell.textLabel?.textAlignment = NSTextAlignment.right

            //set the data here
            return cell
        }
        else if indexPath.section == 2{
            let cell =  tableView.dequeueReusableCell(withIdentifier: fa_support_arrayOfCellData[indexPath.row].cell, for: indexPath) as UITableViewCell

            let (fa_SupportArgumentsContent) =  fa_support_arrayOfCellData[indexPath.row].text
            cell.textLabel?.text = fa_SupportArgumentsContent
             cell.textLabel?.textAlignment = NSTextAlignment.right


            //set the data here
            return cell
        } else {

            let cell =  tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as UITableViewCell

            let (fa_SupportArgumentsContent) =  fa_color_arrayOfCellData[indexPath.row].text
            cell.textLabel?.text = fa_SupportArgumentsContent
             cell.textLabel?.textAlignment = NSTextAlignment.right

            return cell

    }

Answer 1

override func viewWillAppear(animated: Bool) {
    self.navigationController?.navigationBarHidden = false
}

and in next controller use

override func viewWillDisappear(animated: Bool) {
    self.navigationController?.navigationBarHidden = false
}

and also

override func viewWillAppear(_ animated: Bool) {
    // Hide the navigation bar on the this view controller
    self.navigationController?.setNavigationBarHidden(false, animated: true)
}

override func viewWillDisappear(_ animated: Bool) {
    // Show the navigation bar on other view controllers
    self.navigationController?.setNavigationBarHidden(true, animated: true)
}

Answer 2

取消隐藏时，再次将其分配给navigationController